Telephone transmitting apparatus



(No Model.) V 2 Sheets-Sheet 1.

T. J. PERRIN.

TELEPHONE TRANSMITTING APPARATUS.

180.324,?28. Patented Aug. 18, 1885.

WITNESSES INVENTOR Thom o J ferrz'n. 6%; I By 721:) .fllturney-S' Q4. 0.WW

(No Model.) 2 Sheets-Sheet 2.

T. J. PERRIN.

TELEPHONE TRANSMITTING APPARATUS.

No. 324,728. Patented Aug. 18, 1885 WITNESSES 1 iNVENTOR 2720772425JPerrz'n.

N, PETERS. Phflfl'l-ilhogmpher, Washingiun. 04 c.

THOMAS J. PERRIN, OF NEW YORK, N. Y., ASSIGNOR TO THE NATIONAL IMPROVEDTELEPHONE COMPANY, OF NEWV ORLEANS, LOUISIANA.

TELEPHONE TRANSMITTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 324,728, dated August18, 1885. Application filed Marrh 23, ISFS. (No model.)

To aZZ whom it may concern.-

Be it known that I, THOMAS J. PERRIN, of New York city, State of NewYork, have in vented certain new and useful Improvements i n TelephonicTransmitting Apparatus, of which the following is a specification.

My invention relates to that class of instruments in which severaltransmitting diaphragms are employed either to transmit the sameutterance into different circuits or to intensify the effect in a singlecircuit; and the invention consists in certain improvements in theapparatus for conveying the vibrations of the sound uttered to theseveral diaphragms.

In the accompanying drawings, Figure l is a plan view of my improvedapparatus, and Fig. 2 a part elevation partly in section.

A sounding or resonating box, A, of suitable depth, breadth, and length,and preferably rectangular. in cross-section, is made of some resonantmaterial, such as light, wellseasoned wood, and is provided withamouthpiece, A, which is screwed or otherwise secured centrally in itsupper face. Short out- 2 5 ward] yprojecting tubes, B, are secured inapertures in the fiat sides of the resonatingchamber A, and the outerends of these tubes are screw threaded, as shown. Each dia phragm issecured in a suitable case, 0, in the 0 upper face of which, andcentrally over the diaphragm, a sound -conveying tube, D, is screwed orotherwise secured. The upper end of this tube is screw-threaded in adirection reverse to that of its corresponding tube, 3 5 B, and thetubes B and D are drawn together by a reversely internally-threadedsleeve or nut, E. I have illustrated in the presentinstance transmittershaving horizontal diaphragms, as clearly shown at the lefthand 0 side ofFig. 2, and have therefore employed curved sound-conveying tubes D inconnection with them, as shown. The diaphragm F is shown as carrying adownwardly-proiecting pin, f, on the lower end of which an electrode, G,is carried. The other electrode, H, rests loosely on top of theelectrode G, and the pin f passes through it. The upper electrode, H,carries a light metal arm, I, which projects radially from oppositesides, and is turned down at its ends, so that its ends run transmitterwhich may be used in connection,

with my improved sound-distributing apparatus, and it forms thesubjectmatter of another application, filed March 27, 1885, and numbered160,314.

By employing a central resonating or sound- 6 ing chamber thence each toan independent diaphragm I am able to connect or disconnect atransmittingdiaphragm with any of the tubes, so that I may use as manyas the sounding-chamber affords connection for; or I may disconnect someof them and plug up their tubes 13.

I prefer to make the sounding-chamber rectangular in cross-section andof resonant maand separable tubes leading from terial, so that it willtake up and more effectually convey the sound-vibrations to the severaldiaphragms.

I claim as my inventionl. The combination of the independent centralresonating-chamber, the j ointed separable 8o sound-conveying tubesradiating therefrom, and the transmitting diaphragms and electrodes.

2. The combination of the independent central resonating-chamber, amouth-piece and sound-con veying tube connected therewith, the curvedjointed or separable sound -conveying tubes leading to the severaltransmitters, and horizontal transmitting diaphragms and electrodes.

In testimony whereof I have hereunto sub scribed my name.

THOMAS J. PERRIN.

\Vitnesses:

JNo. R. J UDIJN, 19. O. DAVIDSON.

